About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Advanced Coatings for Wear and Corrosion Protection
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| Presentation Title |
Effect of chromium content on intermetallic growth and heat resistance in hot-dip aluminized ferritic stainless steels |
| Author(s) |
Euijin Jung, Jihun Choi, Daeyoon Kim, Jooyoul Huh |
| On-Site Speaker (Planned) |
Euijin Jung |
| Abstract Scope |
Hot-dip aluminized coatings are widely applied to steels for high-temperature use due to their excellent corrosion and heat resistance. This study investigates the effects of chromium (Cr) content in steel on heat resistance and the growth of intermetallic compound (IMC) layers during heat treatments of aluminized ferritic stainless steels in air. Low-carbon steel and two ferritic stainless steels (containing 11.0 and 17.5 wt% Cr) were hot-dip coated with an Al-9 wt% Si alloy and exposed to air at 450 ℃, 500 ℃, and 550℃ for up to 200 h. Without Cr, the η-Fe2Al5 layer rapidly formed at the τ5(H)-Al8Fe2Si/steel interface and grew to become the dominant IMC layer. In contrast, increasing Cr content suppressed η-Fe2Al5 formation at the τ5(C)-Al8(Fe,Cr)2Si/steel interface, leading to enhanced heat resistance. This presentation will discuss the effect of Cr content on coating surface discoloration and IMC growth kinetics, supported by SEM and EBSD microstructural analysis. |